Flue-cutter.



- c'. ZILLGITT an'l W. K. STEBBINS PLUB CUTTER.

. APPLIUATION FILED FEB. 21, 1908.

Patented Nov. 17,1908.

.Nmrwr un Mw UNITED STATES PATENT OFFICE.

CHARLES J. ZILLGITT AND WALTER K. STEBBINS, OF FAIRMOUNT, NORTH DAKOTA.

FLUE-CUTTER.

Specification of Letters Patent.

Patented Nov. 1'7, 1908.

Application filed February 21, 1908. Serial No. 417,106.

To all whom 'it may concern:

Be it known that we, CHARLES J. ZILLGITT and VALTER K. STEBBINS,citizens of the United States, residing at Fairmount, in the county ofRichland and State of North Dakota, have invented certain new and usefulImprovements in Fine-Cutters, of which the following is a specication.

The present invention has for its object to devise a boiler flue cutterof novel form and which will be simple in construction, efficient inoperation and comprise a minimum number of parts.

In its construction, the device comprises a rotary head adapted to beinserted in the flue to be cut from the head or sheet of the boiler,said head being slotted and provided with anti-friction rollers and anadjustable slide, the latter being supplied with a rotary cutter, aframe for Xing the position of the tool when applied to the end of theflue to be out, said frame being connected to the rotary head by meansof a swivel joint, and a pin or shaft slidably mounted in the rotaryhead and having an inclined way to cooperate with the slide bearing therotary cutter, so as to advance the same to the work and at the sametime insure rotation of the head when turning the pin or shaft to carrythe cutter around the inner wall of the flue.

For a full understanding of the invention and the merits thereof andalso to acquire a knowledge of the details of construction and the meansfor effecting the result, reference is to be had to the followingdescription and accompanying drawings.

Thile the invention may be adapted to different forms and conditions bychanges in the structure and minor details without departing from thespirit or essential features thereof, still the preferred embodiment isshown in the accompanying drawings, in which:

Figure 1 is a perspective view of a boiler flue cutter embodying theinvention. Fig. 2 is a central longitudinal section of the tool. Fig. 3is a transverse section on the line @zzof Fig. 2. Fig. 4 is a detailperspective view of the slide. Fig. 5 is a sectional detail of a portionof the shaft, the radially adjustable slide provided with the rotarycutter and the outer confining ring, the slide and cutterl being shownin full lines.

Corresponding and like parts are referred to in the followingdescription and indicated in all the views of the drawings by the samereference characters.

The rotary head 1 has an end portion reduced forming a shoulder 2 and isprovided with a series of slots in which rollers 3 and a slide 4 arefitted. The rollers 3 maintain a fixed relation with reference to therotary head and serve simply to reduce the friction between said headand the flue to be cut. The slide 4 is adjustable radially and isprovided with a rotary cutter 5. The several slots are closed at theirouter ends by means of a ring 6. A frame 7 is fitted upon the rcducedend of the rotary head and is confined between the shoulder 2 and acollar 8,thelatter being slipped upon a projecting end of the reducedportion of the head 1 and secured thereto by means of a pin 9 or in anysubstantial way. The frame 7 is free to rotate upon the rotary head andserves tofiX the position of the tool when fitted to the flue to be cut.The slide 4 consists of a block and is provided at its ends with ribs 10which are mounted in grooves 11 at opposite ends of the slot in whichthe slide 4 is fitted. The ribs 10 and grooves 11 form guides toproperly direct the slide in its movements and prevent the rotary cutterv5 from coming in contact with the side walls of the slot in which theslide 4 is placed. The inner groove 11 is formed in the head 1, whereasthe outer groove is formed in the ring 6. A cross head 12 is provided atthe inner end of each rib 10 to limit the outward movement of the slideThe operating pin or shaft 13 is slidable within the rotary head 1 andis provided in a side with a longitudinally tapered groove 14 whichreceives the inner. end of the slide 4. A stop 15 is provided at theouter end of the groove 14 to engage with the slide 4 and limit therelative outward movement of the pin or shaft 13. A stop 16 projectedlaterally from the pin or shaft 13 near the outer end thereof, isadapted to engage with the rotary head 1 and limit the inward movementof said pin or shaft. The groove 14 constitutes an inclined way or seatin which the inner end of the slide 4 is fitted so that upon pressingthe pin or shaft 13 inward, the slide 4 riding upon the inclined wayprovided by the groove 14, is moved outward, thereby advancing therotary cutter 5 to its work. Any suitable means may be resorted to forrotating the pin or shaft 13 and for this purpose openings 17 formed inthe outer end portion of the pin or shaft 13, are adapted to receive arod or like implement, whereby leverage is provided for both turning thetool and forcing the pin or shaft 13 inward. The set pin or shaft 13 maybe forced inward by tapping the outer end thereof by means of a hammeror other tool.

Having thus described the invention, what is claimed as new is:

In a tool of the character set forth, the

cutter, ribs at the ends of the slide mounted in grooves in the endwalls of the slot in which the slide is arranged, said ribs having crossheads at their inner ends to form stops, a frame connected to the rotaryhead by a swivel joint, and an operating pin or shaft mounted in therotary head to slide therein and having a longitudinally tapered grooveto receive the inner end of the said slide.

In testimony whereof we affix our signatures 1n presence lof twowitnesses.

